Featuresr super bright 22m led light string contains 20 ledsr can be fixed on any cycle with standard spoke with diameter no more than 23mmr onoff button to switch onoff the light and change between two light modessteady or flashr powered by one aa battery continuously flash time up to 20h not includedr water resistant design can be used in rainy daysr no tools required fast and easy installationr make your riding safe and visible at night